Numbers 15:20

‘Until this same day, until you have brought in the offering of your God, you shall eat neither bread nor roasted grain nor new growth. It is to be a perpetual statute throughout your generations in all your places of habitation.

“And the first of all the first fruits of every kind and every contribution of every kind, from all your contributions, shall be for the priests; you shall also give to the priest the first of your dough to cause a blessing to rest on your house.

And if the first piece of dough is holy, the lump is also; and if the root is holy, the branches are too.